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Multiple choice

When the number 398 is divided by 5, the remainder is

  1. 1

  2. 2

  3. 3

  4. 4

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

3^1 = 3 (mod 5), 3^2 = 9 = 4 (mod 5), 3^3 = 27 = 2 (mod 5), 3^4 = 81 = 1 (mod 5). The cycle is 4. 98 / 4 leaves remainder 2. Thus 3^98 = 3^2 = 9 = 4 (mod 5).

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  • Number System (616 questions)
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